Adherent
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Political Usage
Used often in political or ideological contexts to describe committed supporters. He became an adherent of the green movement.
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Positive Connotation
Implies a positive and active support, not just passive agreement. She's been a dedicated adherent of women's rights.
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Not Interchangeable
Not a direct substitute for 'fan' or 'enthusiast' which are less formal and committed. As an adherent, he regularly contributes to the cause.